Caddo Lake State Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Caddo Lake State Park clear sky chart from 2005-11-05 to 2017-09-22.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.
Observation TypeMinimum conditions for hour to be usableOut of hours
Clear of CloudsTransparencySeeingSky Brightness
Planetary:50%(no limit)Average(no limit)Nighttime Hours
Deep Sky:70%Average(no limit)5.9Nighttime Hours
CCD Imaging:70%Below AveragePoor(no limit)Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

PlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
Night
48%
15558
26%
46927
18%
15511
56%
15511
33%
27403

By Month

MonthDays of MonthPlanetaryData
Pts
Deep Sky
Max 60%
Data
Pts
Both Planetary and Deep Sky
Max 60%
Data
Pts
Either Planetary or Deep SkyData
Pts
CCD ImagingData
Pts
January1st to 15thNight
31%
900
26%
2327
9%
895
42%
895
29%
1499
January16th to endNight
29%
960
28%
2496
10%
960
39%
960
29%
1611
February1st to 15thNight
29%
880
23%
2288
8%
876
38%
876
31%
1442
February16th to endNight
24%
512
28%
1774
12%
512
40%
512
25%
1034
March1st to 15thNight
31%
540
26%
1980
14%
540
45%
540
23%
1162
March16th to endNight
32%
576
23%
2112
16%
576
43%
576
26%
1228
April1st to 15thNight
34%
539
25%
1872
15%
539
50%
539
31%
1021
April16th to endNight
37%
540
24%
1800
16%
540
52%
540
29%
1047
May1st to 15thNight
38%
540
21%
1712
13%
540
51%
540
28%
1045
May16th to endNight
52%
563
25%
1684
21%
561
60%
561
35%
970
June1st to 15thNight
76%
540
21%
1620
23%
540
79%
540
44%
862
June16th to endNight
74%
540
25%
1620
26%
540
76%
540
41%
885
July1st to 15thNight
76%
510
21%
1530
24%
510
78%
510
38%
890
July16th to endNight
83%
564
24%
1594
29%
531
85%
531
43%
858
August1st to 15thNight
86%
539
30%
1620
35%
536
87%
536
51%
813
August16th to endNight
74%
573
21%
1910
26%
573
75%
573
29%
1163
September1st to 15thNight
72%
540
23%
1864
27%
540
73%
540
33%
1050
September16th to endNight
73%
513
33%
1891
35%
513
76%
513
37%
954
October1st to 15thNight
63%
657
32%
1977
24%
657
68%
657
41%
1065
October16th to endNight
54%
704
37%
2112
23%
704
65%
704
43%
1096
November1st to 15thNight
49%
700
30%
2100
20%
700
57%
700
37%
1157
November16th to endNight
39%
768
32%
2208
18%
768
50%
768
31%
1336
December1st to 15thNight
35%
900
25%
2340
12%
900
43%
900
28%
1529
December16th to endNight
31%
960
22%
2496
9%
960
39%
960
26%
1686

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

Occurrence of each ForecastData
Points
Cloud CoverDay
12%5%25%435%45%7%43%
47950
Night
10%424423447%51%
47123
TransparencyDay
39%5%9%19%19%5%
47650
Night
33%410%21%21%9%
46928
SeeingDay
12%5%19%28%25%8%
5599
Night
14%7%24%30%20%3
15558

By Month

Percentage Cloud Cover SE (2006-)
Color Meanings:
Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
16%7%35%32312448%
1611
16th to endDay
19%7%2331333448%
1728
February1st to 15thDay
18%7%25%5%2322444%
1575
16th to endDay
18%7%34323235%45%
1707
March1st to 15thDay
21%7%24423235%41%
1980
16th to endDay
14%7%36%5%23345%41%
2110
April1st to 15thDay
11%6%24424347%46%
2076
16th to endDay
12%5%26%5%35%45%6%41%
2160
May1st to 15thDay
13%7%27%5%35%5%46%37%
2236
16th to endDay
9%5%25%6%45%5%6%10%37%
2430
June1st to 15thDay
5%315%6%46%7%7%9%41%
2340
16th to endDay
6%425%6%47%7%7%10%37%
2340
July1st to 15thDay
7%435%7%37%7%7%11%33%
2340
16th to endDay
6%425%5%38%7%8%10%36%
2466
August1st to 15thDay
4414446%6%7%9%45%
2328
16th to endDay
10%426%6%46%7%8%9%31%
2292
September1st to 15thDay
10%415%446%5%5%8%42%
2093
16th to endDay
7%31444445%7%52%
1873
October1st to 15thDay
10%424423446%52%
1650
16th to endDay
14%32221233460%
1760
November1st to 15thDay
11%425%313446%50%
1758
16th to endDay
16%6%3431222351%
1749
December1st to 15thDay
18%8%35%21223445%
1620
16th to endDay
17%8%25%434335%41%
1728
January1st to 15thNight
16%6%2432222450%
2327
16th to endNight
18%5%2422333450%
2496
February1st to 15thNight
14%6%23313335%52%
2278
16th to endNight
17%5%24322335%50%
1774
March1st to 15thNight
16%6%23324346%46%
1980
16th to endNight
12%5%24423347%48%
2112
April1st to 15thNight
7%42342445%7%52%
1872
16th to endNight
9%5%25%425%45%7%48%
1800
May1st to 15thNight
10%5%35%3245%48%45%
1711
16th to endNight
8%3245%3446%9%48%
1683
June1st to 15thNight
3213325%35%9%58%
1620
16th to endNight
32233245%5%8%56%
1620
July1st to 15thNight
6%31342447%13%47%
1620
16th to endNight
32133236%7%13%52%
1702
August1st to 15thNight
31222345%11%60%
1630
16th to endNight
6%4145%46%7%7%10%40%
1910
September1st to 15thNight
9%5%233235%5%8%50%
1864
16th to endNight
6%313433347%57%
1891
October1st to 15thNight
7%314423346%58%
1977
16th to endNight
12%212312225%63%
2112
November1st to 15thNight
8%314323346%57%
2100
16th to endNight
14%5%2432233453%
2208
December1st to 15thNight
14%6%24423346%46%
2340
16th to endNight
18%7%24423235%44%
2496

Transparency (when cloud cover <= 30%)
Color Meanings:
Too cloudy to forecast Poor Below Average Average Above average Transparent
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
41%2417%24%8%
1612
16th to endDay
40%2419%24%8%
1728
February1st to 15thDay
45%25%16%20%9%
1576
16th to endDay
43%35%15%23%8%
1707
March1st to 15thDay
47%26%18%17%7%
1980
16th to endDay
44%47%17%23%3
2112
April1st to 15thDay
38%38%20%20%8%
2076
16th to endDay
42%5%8%18%20%4
2160
May1st to 15thDay
46%5%8%14%17%6%
2236
16th to endDay
41%7%12%22%14%1
2434
June1st to 15thDay
37%7%12%25%15%1
2340
16th to endDay
37%8%14%20%17%2
2340
July1st to 15thDay
40%8%15%24%10%
2201
16th to endDay
37%9%18%22%11%
2311
August1st to 15thDay
31%7%14%28%15%1
2314
16th to endDay
44%9%15%18%10%1
2292
September1st to 15thDay
38%7%12%17%16%7%
2093
16th to endDay
30%5%9%23%21%9%
1873
October1st to 15thDay
33%48%16%22%14%
1650
16th to endDay
28%25%18%32%12%
1760
November1st to 15thDay
34%46%23%22%7%
1758
16th to endDay
39%2414%30%9%
1749
December1st to 15thDay
44%27%18%19%6%
1620
16th to endDay
46%27%19%19%4
1728
January1st to 15thNight
39%26%14%26%10%
2327
16th to endNight
40%25%15%24%11%
2496
February1st to 15thNight
36%36%20%21%11%
2288
16th to endNight
38%36%19%20%11%
1774
March1st to 15thNight
39%38%18%20%9%
1980
16th to endNight
37%48%20%23%5%
2112
April1st to 15thNight
30%5%10%23%19%10%
1872
16th to endNight
33%6%9%21%22%7%
1800
May1st to 15thNight
37%5%10%18%17%10%
1712
16th to endNight
31%415%25%19%2
1685
June1st to 15thNight
22%7%13%30%23%3
1620
16th to endNight
25%6%14%23%25%4
1620
July1st to 15thNight
27%8%17%29%15%1
1530
16th to endNight
21%9%22%29%16%1
1594
August1st to 15thNight
18%5%16%35%19%3
1620
16th to endNight
35%7%17%21%14%3
1910
September1st to 15thNight
30%6%13%21%17%9%
1864
16th to endNight
26%49%21%25%13%
1891
October1st to 15thNight
27%47%20%22%18%
1977
16th to endNight
25%25%16%29%20%
2112
November1st to 15thNight
29%38%20%26%11%
2100
16th to endNight
36%2414%27%14%
2208
December1st to 15thNight
40%38%20%18%7%
2340
16th to endNight
44%27%17%20%7%
2496

Seeing (when cloud cover <= 80%)
Color Meanings:
Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
MonthDays in MonthOccurrence of each ForecastData
Points
January1st to 15thDay
16%13%44%17%7%
90
16th to endDay
19%27%34%12%5%1
96
February1st to 15thDay
11%28%44%8%6%
90
16th to endDay
22%18%40%14%3
81
March1st to 15thDay
25%25%35%11%2
90
16th to endDay
15%20%21%35%6%
96
April1st to 15thDay
14%16%33%22%11%1
195
16th to endDay
17%12%28%25%12%2
270
May1st to 15thDay
15%9%37%24%10%1
373
16th to endDay
14%429%30%16%4
517
June1st to 15thDay
8%112%38%32%7%
495
16th to endDay
7%114%34%30%12%
495
July1st to 15thDay
9%11%36%33%9%
475
16th to endDay
7%5%28%44%14%
515
August1st to 15thDay
8%1328%43%15%
481
16th to endDay
18%7%20%36%16%
332
September1st to 15thDay
6%7%25%39%20%
248
16th to endDay
47%41%32%13%
108
October1st to 15thDay
1218%48%21%7%
90
16th to endDay
20%5%21%23%22%5%
96
November1st to 15thDay
15%7%35%31%8%1
90
16th to endDay
28%11%33%15%10%1
90
December1st to 15thDay
31%8%36%10%8%4
90
16th to endDay
22%20%34%15%42
96
January1st to 15thNight
21%14%29%26%7%
900
16th to endNight
21%13%33%26%4
960
February1st to 15thNight
19%11%36%26%6%
880
16th to endNight
20%15%38%22%3
512
March1st to 15thNight
19%10%35%26%7%
540
16th to endNight
15%10%38%25%9%
576
April1st to 15thNight
10%13%39%25%11%
539
16th to endNight
13%8%37%26%12%1
540
May1st to 15thNight
12%7%37%28%11%1
540
16th to endNight
9%227%36%21%2
563
June1st to 15thNight
410%40%40%3
540
16th to endNight
412%35%38%8%
540
July1st to 15thNight
7%7%39%40%6%
510
16th to endNight
45%29%48%11%
564
August1st to 15thNight
4432%46%12%
539
16th to endNight
9%5%32%43%8%
573
September1st to 15thNight
11%7%30%40%8%
540
16th to endNight
7%110%31%43%5%
513
October1st to 15thNight
8%317%37%27%4
657
16th to endNight
13%5%24%31%22%3
704
November1st to 15thNight
10%6%29%34%17%2
700
16th to endNight
18%11%27%27%13%1
768
December1st to 15thNight
19%12%29%30%8%
900
16th to endNight
23%12%28%27%7%
960
Page generated at 2017-09-23 05:43:41. Version ac04

Copyright 2017 A. Danko


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